I'm also getting strange behaviour with the watchlist, especially on the NOW TV box, duplicate entries, removing one duplicate entry removes both, missing entries etc. and there's been a couple of other people posting on the forum. Hopefully this will get sorted out in the next day or two, I'd guess it's related to the continue watching issue which seems to be just about sorted now.
Is there any update on this issue. I also have greyed out shows no longer available that I cannot remove from My TV watchlist. Tried rebooting, factory resetting the boxes but nothing is working. Not exactly a crisis but is irritating as my list is longer than it needs to be.
@NPOWELL There is an updated app that fixes this on the way. The NOW TV Smart Box has received it already but it's not rolled out to the black box yet. You don't need to reboot or factory reset the box as any update will be delivered automatically.